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Nonsymmorphic Dirac semimetal and carrier dynamics in the doped spin-orbit-coupled Mott insulator Sr2IrO4

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Title
Nonsymmorphic Dirac semimetal and carrier dynamics in the doped spin-orbit-coupled Mott insulator Sr2IrO4
Author(s)
Han, J.W.; Sun-Woo Kim; Wonshik Kyung; Changyoung Kim; Cao, G.; Chen, X.; Wilson, S.D.; Sangmo Cheon; Lee, J.S.
Subject
ELECTRON-ELECTRON INTERACTIONS, ; OPTICAL-CONSTANTS, ; TEMPERATURE, ; PHYSICS, ; METAL
Publication Date
2020-07
Journal
PHYSICAL REVIEW B, v.102, no.4, pp.041108(R)
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society. A Dirac fermion emerges as a result of interplay between symmetry and topology in condensed matter. Current research moves towards investigating the Dirac fermions in the presence of many-body effects in correlated systems. Here, we demonstrate the emergence of a correlation-induced symmetry-protected Dirac semimetal state in the lightly doped spin-orbit-coupled Mott insulator Sr2IrO4. We find that the nonsymmorphic crystalline symmetry stabilizes a Dirac line-node semimetal and that the correlation-induced symmetry-breaking electronic order further leads to a phase transition from the Dirac line-node to a Dirac point-node semimetal. The latter state is experimentally confirmed by angle-resolved photoemission spectroscopy and terahertz spectroscopy on Sr2(Ir,Tb)O4 and (Sr,La)2IrO4. Remarkably, the electrodynamics of the massless Dirac carriers is governed by the extremely small scattering rate of about 6 cm-1 even at room temperature, which is iconic behavior of relativistic quasiparticles. Temperature-dependent changes in electrodynamic parameters are also consistently explained based on the Dirac point-node semimetal state
URI
https://pr.ibs.re.kr/handle/8788114/7751
DOI
10.1103/PhysRevB.102.041108
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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